Problem just occurs today. I come to a stop light and it would idle up and down. Say 1500 then to 500 then up and down again, non stop. I does not settle into the 750rpm range. It sounds as if the computer is compensating for an air leak at the intake or something.

If I am trying to follow an air leak problem where would a leak normally occurs in the intake path? I am suspecious of airleak or some worn rubber hose because car overheated over last July/August and something must have melt in the engine. During that time I had a fanclutch that went and the engine temperature went up high for a few weeks until I had the clutch replaced. Now this is probably the result of that incident.

Hope someone can help me pin-point the problem.